Low-medicament electroplating wastewater circulating treatment equipment and treatment method

Abstract

The invention discloses low-medicament electroplating wastewater circulation treatment equipment and a treatment method.The low-medicament electroplating wastewater circulation treatment equipment comprises a fixing frame, and an electroplating water tank is welded to one end of the fixing frame. During use, NaOH-citric acid composite wheat straw is placed in a PVC column sleeve, then a biological contact oxidation frame is filled with pseudomonas three-dimensional elastic filler, and the biological contact oxidation frame is sealed; the PVC column sleeve is movably closed relative to the second supporting frame, the biological contact oxidation frame is movably closed relative to the first supporting frame, the movable frame is descended relative to the biological contact oxidation frame, the movable frame is movably descended relative to the PVC column sleeve, and finally, the NaOH-citric acid composite wheat straw surface hydroxyl, carboxyl and heavy metal ions are subjected to a complexation reaction. The surface of the pseudomonas three-dimensional elastic filler is inoculated with a compound microbial flora for microbial metabolism to degrade COD, a water pump is turned on, and water purified by the water pump is discharged into an electroplating water tank for circular treatment, so that the low-medicament electroplating wastewater circular treatment equipment and treatment method are completed.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a low-chemical electroplating wastewater recycling treatment device and treatment method. Background Technology

[0002] As a key link in the manufacturing industry, the development of wastewater treatment technology in the electroplating industry has always been closely linked to environmental standards, industry needs, and advancements in materials science. The emergence of low-chemical electroplating wastewater recycling technology is not an isolated technological breakthrough, but rather a new generation of technology system formed against the backdrop of long-term bottlenecks in traditional processes, continuous upgrading of environmental standards, and increasingly severe resource constraints. Therefore, we need a low-chemical electroplating wastewater recycling treatment equipment and treatment method.

[0003] The current low-chemical electroplating wastewater recycling equipment and treatment methods rely on specific chemical reactions to remove heavy metals. These reactions have a minimum reagent equivalent. If the amount is below this equivalent, the pollutants cannot be completely converted or removed, making it impossible to reduce the amount of reagent used. This also prevents the additional installation of core components used for pollutant removal, and the overall installation process is limited by the confined space. Summary of the Invention

[0004] The purpose of this invention is to provide a low-reagent electroplating wastewater recycling treatment device and method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A low-chemical electroplating wastewater recycling treatment device includes a fixed frame, an electroplating water tank welded to one end of the fixed frame, a first conduit welded to one side of the electroplating water tank, a first connecting rod installed on the inner wall of each first conduit, a first connecting sleeve fixedly connected to the outer wall of each first connecting rod, a water pump abutting one end of the first conduit, a fixed rod fixedly connected to the inner wall of each water pump, a second connecting rod installed on the inner wall of each water pump, a second connecting sleeve fixedly connected to the outer wall of each second connecting rod, a second conduit abutting the other side of the water pump, a removal box welded to one end of the second conduit, a third conduit welded to one side of the removal box, a movable frame installed on the outer wall of the removal box, a biological contact oxidation frame installed on the inner wall of the movable frame, a first support frame installed on the inner wall of each biological contact oxidation frame, a Pseudomonas aeruginosa three-dimensional elastic packing material installed on the inner wall of each biological contact oxidation frame, a PVC column sleeve installed on the inner wall of the movable frame, a second support frame installed on the inner wall of each PVC column sleeve, NaOH-citric acid composite wheat straw installed inside the PVC column sleeve, and a plug fixedly connected to the inner wall of each PVC column sleeve.

[0007] Preferably, the water pump is threadedly connected to the fixing rod, and the fixing rod is symmetrically arranged about the central axis of the water pump.

[0008] Preferably, the movable connection between the box and the mobile frame is removed, and the inner wall of the mobile frame is designed with openings.

[0009] Preferably, the biological contact oxidation frame is movably connected to the first support frame, and the first support frame is symmetrically arranged about the central axis of the biological contact oxidation frame.

[0010] Preferably, the Pseudomonas spp. three-dimensional elastic packing material is arranged at equal intervals on the inner wall of the biological contact oxidation frame, and the inner wall of the biological contact oxidation frame is arranged in a grid pattern.

[0011] Preferably, the PVC sleeve is threaded to the plug, and the inner wall of the PVC sleeve is designed with an opening.

[0012] A low-reagent electroplating wastewater recycling treatment device and method includes the following steps:

[0013] S1. Align the water pump with the first conduit and the second conduit respectively, engage and fix the first connecting rod with the first conduit and the water pump, then thread the first connecting sleeve onto the first connecting rod, then engage and fix the water pump with the second conduit, and then thread the second connecting sleeve onto the second connecting rod.

[0014] S2. Secure the fixed rod to the water pump with threads, then lift the moving frame to the biological contact oxidation frame, open the biological contact oxidation frame to the first support frame, and then lock the first support frame to the moving frame.

[0015] S3. Lift the PVC column sleeve of the movable frame, open the second support frame of the PVC column sleeve, lock the movable frame of the second support frame, pull the removal box of the movable frame, unscrew the plug of the PVC column sleeve, place the NaOH-citric acid composite wheat straw inside the PVC column sleeve, screw the plug of the PVC column sleeve back on, and then fill the biological contact oxidation frame with the Pseudomonas spp. three-dimensional elastic filler.

[0016] S4. Next, close the removal box to the moving frame, engage and disengage the second support frame to the moving frame, close the PVC column sleeve to the second support frame, engage and disengage the first support frame to the moving frame, close the biological contact oxidation frame to the first support frame, lower the moving frame to the biological contact oxidation frame, and lower the moving frame to the PVC column sleeve.

[0017] S5. Finally, the electroplating wastewater inside the electroplating water tank is discharged into the removal tank. The complexation reaction of the hydroxyl and carboxyl groups on the surface of the NaOH-citric acid composite wheat straw with heavy metal ions is carried out, and some of the COD in the water is adsorbed, reducing the load on subsequent treatment. The surface of the Pseudomonas spp. three-dimensional elastic packing is inoculated with a composite microbial community to carry out microbial metabolism to degrade COD. At the same time, the microbial flocculation effect adsorbs some heavy metals, without the need to add chemical agents. The water pump is turned on to drive the purified water to be discharged into the electroplating water tank for circulation treatment.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. A movable frame is used to activate the biological contact oxidation frame, allowing for rapid expansion and increasing the operating space. Pseudomonas spp. three-dimensional elastic packing material is placed inside the frame. The extracellular enzymes secreted by the packing material decompose large organic molecules in the wastewater, including EDTA in EDTA-heavy metal complexes, into smaller organic molecules such as organic acids and amino acids. With oxygen provided by aeration at the bottom of the frame, the packing material completely oxidizes and decomposes these smaller organic molecules through aerobic respiration, meeting the influent requirements for subsequent advanced treatment. Furthermore, the packing material inhibits the heavy metals in electroplating wastewater by synthesizing metallothionein through regulating its metabolic pathways. To enhance resistance to toxicity and prevent damage to enzyme activity, ensuring the continuous metabolic process, the EPS secreted by *Pseudomonas* 3D elastic packing material during metabolism exhibits strong flocculation properties. The hydroxyl, carboxyl, and amino groups in the EPS molecules can form coordination bonds with heavy metal ions. Simultaneously, the heavy metal ions are encapsulated into flocs through hydrogen bonds and van der Waals forces between EPS molecules. The peptidoglycan and phospholipids on the cell wall surface of the *Pseudomonas* 3D elastic packing material also have the ability to adsorb heavy metals. The synergistic effect of adsorption and EPS flocculation reduces the concentration of heavy metals in wastewater, alleviating the load on subsequent advanced treatment. When the adsorption capacity of the *Pseudomonas* 3D elastic packing material reaches saturation, regeneration can be achieved through aeration backwashing and nutrient supplementation, promoting *Pseudomonas* reproduction, re-secreting EPS, and restoring adsorption capacity. After regeneration, the adsorption efficiency of the *Pseudomonas* 3D elastic packing material can be restored to over 85% of its initial state, with a service life of up to 2 years. This not only significantly reduces operating costs but also avoids secondary pollution from chemical agents.

[0020] 2. A movable frame is used to move the PVC column sleeve, allowing for expansion and increasing the operating space. NaOH-citric acid composite wheat straw fills the PVC column sleeve. When electroplating wastewater containing heavy metals flows through the NaOH-citric acid composite wheat straw inside the PVC column sleeve, the heavy metal ions first undergo a complexation reaction with the carboxyl groups on the surface of the NaOH-citric acid composite wheat straw. The oxygen atoms in the carboxyl groups provide lone pairs of electrons, which then react with Ni... 2+ A stable six-membered ring complex is formed, and at the same time, the hydroxyl group reacts with Ni. 2 The formation of coordination bonds further enhances adsorption stability. This complexation reaction is most efficient in the pH range of 5-8, which perfectly matches the pH range of electroplating wastewater. Highly efficient adsorption can be achieved directly using the pH of the pretreated wastewater, further reducing reagent consumption. The adsorption of heavy metals by the NaOH-citric acid composite wheat straw conforms to the pseudo-second-order kinetic model. The lignin component retained after modification of the NaOH-citric acid composite wheat straw is hydrophobic, which can adsorb hydrophobic organic matter in the wastewater through hydrophobic interactions. The porous structure formed by the alkaline hydrolysis modification of the NaOH-citric acid composite wheat straw can remove large molecular organic suspended solids in the wastewater through physical interception, further reducing COD and preventing clogging of subsequent treatment units. Attached Figure Description

[0021] Figure 1 This is a front view structural diagram of a low-reagent electroplating wastewater recycling treatment device and treatment method according to the present invention.

[0022] Figure 2 This is a rear view structural schematic diagram of a low-reagent electroplating wastewater recycling treatment device and treatment method according to the present invention;

[0023] Figure 3 This is a sectional view of a low-reagent electroplating wastewater recycling treatment device and treatment method according to the present invention.

[0024] Figure 4 This is a schematic diagram of the combined structure of the movable frame, biological contact oxidation frame and first support frame of the low-reagent electroplating wastewater recycling treatment equipment and treatment method of the present invention.

[0025] Figure 5 This is a schematic diagram of the combined structure of the PVC column sleeve and the second support frame parts in a low-reagent electroplating wastewater recycling treatment device and method according to the present invention.

[0026] Figure 6 This invention relates to a low-reagent electroplating wastewater recycling treatment device and treatment method. Figure 1 Enlarged structural diagram of section A in the middle;

[0027] In the diagram: 1. Fixing frame; 2. Electroplating water tank; 3. First conduit; 4. First connecting rod; 5. First connecting sleeve; 6. Water pump; 7. Fixing rod; 8. Second connecting rod; 9. Second connecting sleeve; 10. Second conduit; 11. Removal box; 12. Third conduit; 13. Movable frame; 14. Biological contact oxidation frame; 15. First support frame; 16. Pseudomonas spp. three-dimensional elastic packing material; 17. PVC column sleeve; 18. Second support frame; 19. NaOH-citric acid composite wheat straw; 20. Plug. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-6 This invention provides a low-reagent electroplating wastewater recycling treatment equipment and treatment method technical solution:

[0030] A low-chemical electroplating wastewater recycling treatment device includes a fixed frame 1, an electroplating water tank 2 welded to one end of the fixed frame 1, a first conduit 3 welded to one side of the electroplating water tank 2, a first connecting rod 4 installed on the inner wall of the first conduit 3, a first connecting sleeve 5 fixedly connected to the outer wall of the first connecting rod 4, a water pump 6 abutting one end of the first conduit 3, a fixed rod 7 fixedly connected to the inner wall of the water pump 6, a second connecting rod 8 installed on the inner wall of the water pump 6, a second connecting sleeve 9 fixedly connected to the outer wall of the second connecting rod 8, a second conduit 10 abutting the other side of the water pump 6, and a removal tank 11 welded to one end of the second conduit 10. A third conduit 12 is welded to one side of the removal box 11. A movable frame 13 is installed on the outer wall of the removal box 11. A biological contact oxidation frame 14 is installed on the inner wall of the movable frame 13. A first support frame 15 is installed on the inner wall of each biological contact oxidation frame 14. Pseudomonas spp. three-dimensional elastic packing material 16 is provided on the inner wall of each biological contact oxidation frame 14. A PVC column sleeve 17 is installed on the inner wall of the movable frame 13. A second support frame 18 is installed on the inner wall of each PVC column sleeve 17. NaOH-citric acid composite wheat straw 19 is provided inside the PVC column sleeve 17. A plug 20 is fixedly connected to the inner wall of each PVC column sleeve 17.

[0031] The water pump 6 is threadedly connected to the fixing rod 7, and the fixing rod 7 is symmetrically arranged about the central axis of the water pump 6.

[0032] Remove the movable connection between the box 11 and the movable frame 13, and the inner wall of the movable frame 13 is designed with openings.

[0033] The biological contact oxidation frame 14 is movably connected to the first support frame 15, and the first support frame 15 is symmetrically arranged about the central axis of the biological contact oxidation frame 14.

[0034] The Pseudomonas spp. three-dimensional elastic packing material 16 is arranged at equal intervals on the inner wall of the biological contact oxidation frame 14, and the inner wall of the biological contact oxidation frame 14 is arranged in a grid pattern.

[0035] The PVC sleeve 17 is threaded to the plug 20, and the inner wall of the PVC sleeve 17 has an open design.

[0036] A method for using a low-reagent electroplating wastewater recycling treatment device and treatment method includes the following steps:

[0037] S1. Align the water pump 6 with the first conduit 3 and the second conduit 10 respectively, engage and fix the first connecting rod 4 with the first conduit 3 and the water pump 6, then thread the first connecting sleeve 5 onto the first connecting rod 4, then engage and fix the water pump 6 with the second conduit 10 with the second connecting rod 8, and then thread the second connecting sleeve 9 onto the second connecting rod 8.

[0038] S2. Secure the fixed rod 7 to the water pump 6 with threads, then lift the moving frame 13 to the biological contact oxidation frame 14, open the biological contact oxidation frame 14 to the first support frame 15, and then lock the first support frame 15 to the moving frame 13.

[0039] S3. Lift the PVC column sleeve 17 by moving the mobile frame 13, open the second support frame 18 by moving the PVC column sleeve 17, lock the mobile frame 13 by locking the second support frame 18, pull the removal box 11 out of the mobile frame 13, unscrew the plug 20 by moving the PVC column sleeve 17, place the NaOH-citric acid composite wheat straw 19 inside the PVC column sleeve 17, screw the plug 20 by moving the PVC column sleeve 17, and fill the biological contact oxidation frame 14 with the Pseudomonas spp. three-dimensional elastic filler 16.

[0040] S4. Next, the removal box 11 is moved to close the movable frame 13, the second support frame 18 is engaged and disengaged from the movable frame 13, the PVC column sleeve 17 is moved to close the second support frame 18, the first support frame 15 is engaged and disengaged from the movable frame 13, the biological contact oxidation frame 14 is moved to close the first support frame 15, the movable frame 13 is lowered from the biological contact oxidation frame 14, and the movable frame 13 is moved to lower the PVC column sleeve 17.

[0041] S5. Finally, the electroplating wastewater inside the electroplating water tank 2 is discharged into the removal tank 11. The hydroxyl and carboxyl groups on the surface of the NaOH-citric acid composite wheat straw 19 undergo a complexation reaction with heavy metal ions, thereby adsorbing some of the COD in the water and reducing the load on subsequent treatment. The surface of the Pseudomonas stoichiometric elastic filler 16 is inoculated with a composite microbial community for microbial metabolism to degrade COD. At the same time, the microbial flocculation effect adsorbs some heavy metals, eliminating the need for chemical agents. The water pump 6 is turned on, and the water pump 6 drives the purified water to be discharged into the electroplating water tank 2 for circulation treatment.

[0042] It should be noted that this invention is a low-chemical electroplating wastewater recycling treatment device and method. In use, the water pump 6 is engaged and aligned with the first conduit 3 and the second conduit 10 respectively. The first connecting rod 4 is engaged and fixed to the first conduit 3 and the water pump 6. The first connecting sleeve 5 is then threaded onto the first connecting rod 4. The second connecting rod 8 is then engaged and fixed to the water pump 6 and the second conduit 10. The second connecting sleeve 9 is then threaded onto the second connecting rod 8. The water pump 6 is then engaged and aligned with the first conduit 3 and the second conduit 10 respectively. The first connecting rod 4 is then engaged and fixed onto the first conduit 3 and the water pump 6. Next, thread the first connecting sleeve 5 onto the first connecting rod 4, then engage and fix the second connecting rod 8 onto the water pump 6 and the second conduit 10, then thread the second connecting sleeve 9 onto the second connecting rod 8, then move the movable frame 13 to lift the PVC column sleeve 17, then move the PVC column sleeve 17 onto the second support frame 18, then engage and fix the second support frame 18 onto the movable frame 13, then move the removal box 11 away from the movable frame 13, then unscrew the plug 20 from the PVC column sleeve 17, and place the NaOH-citric acid composite wheat straw 19 into the PVC column sleeve 17. Inside, the PVC column sleeve 17 is then threaded onto the plug 20. Next, the Pseudomonas spp. three-dimensional elastic filler 16 is filled into the biological contact oxidation frame 14. Then, the removal box 11 is moved to close the movable frame 13. The second support frame 18 is engaged and disengaged from the movable frame 13. The PVC column sleeve 17 is moved to close the second support frame 18. The first support frame 15 is engaged and disengaged from the movable frame 13. The biological contact oxidation frame 14 is moved to close the first support frame 15. The movable frame 13 is lowered onto the biological contact oxidation frame 14. Finally, the movable frame 13 is moved to lower the PVC column sleeve 17. Finally, the electroplating wastewater inside the electroplating water tank 2 is discharged into the removal tank 11. The hydroxyl and carboxyl groups on the surface of the NaOH-citric acid composite wheat straw 19 undergo a complexation reaction with heavy metal ions, thereby adsorbing some of the COD in the water and reducing the load on subsequent treatment. The surface of the Pseudomonas stoichiometric elastic filler 16 is inoculated with a composite microbial community for microbial metabolism to degrade COD. At the same time, the microbial flocculation effect adsorbs some heavy metals, eliminating the need for chemical agents. The water pump 6 is turned on, and the water pump 6 drives the purified water to be discharged into the electroplating water tank 2 for circulation treatment. In this way, a low-chemical electroplating wastewater circulation treatment equipment and treatment method are completed.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-reagent electroplating wastewater recycling treatment device, characterized in that: Includes a fixed frame (1), one end of which is welded to an electroplating water tank (2), and one side of the electroplating water tank (2) is welded to a first conduit (3). The inner wall of the first conduit (3) is fitted with a first connecting rod (4), and the outer wall of the first connecting rod (4) is fixedly connected to a first connecting sleeve (5). One end of the first conduit (3) abuts against a water pump (6), the inner wall of the water pump (6) is fixedly connected to a fixed rod (7), the inner wall of the water pump (6) is fitted with a second connecting rod (8), and the outer wall of the second connecting rod (8) is fixedly connected to a second connecting sleeve (9). The other side of the water pump (6) abuts against a second conduit (10), and one end of the second conduit (10) is welded to a removal box (11). A third conduit (12) is welded to one side of the box (11). A movable frame (13) is installed on the outer wall of the box (11). A biological contact oxidation frame (14) is installed on the inner wall of the movable frame (13). A first support frame (15) is installed on the inner wall of the biological contact oxidation frame (14). Pseudomonas spp. three-dimensional elastic packing material (16) is provided on the inner wall of the biological contact oxidation frame (14). A PVC column sleeve (17) is installed on the inner wall of the movable frame (13). A second support frame (18) is installed on the inner wall of the PVC column sleeve (17). NaOH-citric acid composite wheat straw (19) is provided inside the PVC column sleeve (17). A plug (20) is fixedly connected to the inner wall of the PVC column sleeve (17).

2. A low-reagent electroplating wastewater recycling treatment device according to claim 1, characterized in that: The water pump (6) is threadedly connected to the fixing rod (7), and the fixing rod (7) is symmetrically arranged with respect to the central axis of the water pump (6).

3. A low-reagent electroplating wastewater recycling treatment device according to claim 1, characterized in that: Remove the movable connection between the box (11) and the movable frame (13), and the inner wall of the movable frame (13) is designed with openings.

4. A low-reagent electroplating wastewater recycling treatment device according to claim 1, characterized in that: The biological contact oxidation frame (14) is movably connected to the first support frame (15), and the first support frame (15) is symmetrically arranged about the central axis of the biological contact oxidation frame (14).

5. A low-reagent electroplating wastewater recycling treatment device according to claim 1, characterized in that: The Pseudomonas spp. three-dimensional elastic packing material (16) is arranged at equal intervals on the inner wall of the biological contact oxidation frame (14), and the inner wall of the biological contact oxidation frame (14) is arranged in a grid pattern.

6. A low-reagent electroplating wastewater recycling treatment device according to claim 1, characterized in that: The PVC sleeve (17) is threaded to the plug (20), and the inner wall of the PVC sleeve (17) is designed with an opening.

7. A low-reagent electroplating wastewater recycling treatment device and method, characterized in that: Includes the following steps: S1. Align the water pump (6) with the first conduit (3) and the second conduit (10) respectively, engage and fix the first connecting rod (4) with the first conduit (3) and the water pump (6), then thread the first connecting sleeve (5) onto the first connecting rod (4), then engage and fix the second connecting rod (8) with the water pump (6) and the second conduit (10), and then thread the second connecting sleeve (9) onto the second connecting rod (8). S2. Fix the fixed rod (7) to the water pump (6) with threads, then lift the biological contact oxidation frame (14) with the moving frame (13), open the biological contact oxidation frame (14) to the first support frame (15), and then lock the first support frame (15) to the moving frame (13). S3. Lift the PVC column sleeve (17) with the movable frame (13), open the second support frame (18) with the PVC column sleeve (17), lock the movable frame (13) with the second support frame (18), pull the removal box (11) open the movable frame (13), unscrew the plug (20) with the PVC column sleeve (17), place the NaOH-citric acid composite wheat straw (19) inside the PVC column sleeve (17), screw the plug (20) with the PVC column sleeve (17), and fill the biological contact oxidation frame (14) with the Pseudomonas spp. stereoelastic filler (16). S4. Next, the removal box (11) is moved to close the movable frame (13), the second support frame (18) is engaged and disengaged from the movable frame (13), the PVC column sleeve (17) is moved to close the second support frame (18), the first support frame (15) is engaged and disengaged from the movable frame (13), the biological contact oxidation frame (14) is moved to close the first support frame (15), the movable frame (13) is lowered from the biological contact oxidation frame (14), and the movable frame (13) is moved to lower the PVC column sleeve (17). S5. Finally, the electroplating wastewater inside the electroplating water tank (2) is discharged into the removal tank (11). The complexation reaction of the hydroxyl and carboxyl groups on the surface of the NaOH-citric acid composite wheat straw (19) with heavy metal ions is carried out, and some of the COD in the water is adsorbed to reduce the load of subsequent treatment. The surface of the Pseudomonas stoichiometric elastic filler (16) is inoculated with composite microbial flora to carry out microbial metabolism to degrade COD. At the same time, the microbial flocculation effect adsorbs some heavy metals, and no chemical agents need to be added. The water pump (6) is turned on and the water pump (6) drives the purified water to be discharged into the electroplating water tank (2) for circulation treatment.

Images